Speed differential has direct relationship with road safety.Conventional speed consistency measures draw sample data from independent population that follows a normal distribution.These methods may fall into ecological fallacy and overestimate the safety level of road elements.After deducing the relationship between the difference in operating speed ΔV85 and 85(ΔV),the 85th percentile value of individual speed reduction,this paper recommends 85(ΔV) and speed reduction rate 85(ΔV)R is used to evaluate ramp s...
【基金】
“十一五”国家科技支撑计划资助项目(2006BAJ18B03);
A Project Sponsored by:Florida Department of Trans-portation(Contract No.:BD544 38)